Genesys GDR- COM Series, Руководство по установке, Страница: 54 / 62

GDR-XXXX NAV/COMM INSTALLATION MANUAL
64-000109 Page 54 of 62
32. ARINC Label 040, UHF COM
Label 040 is used to control the UHF COM transceiver. UHF operation covers the band of 225
to 399.975 MHz. Operations can be simplex or semi-duplex operation when a repeater is
utilized. In semi-duplex operation, the transmission frequency is different from the received
frequency.
When the semi-duplex mode is chosen, two label pairs shall be sent, back to back, with the
proper encoding to provide both the Main transmit and receive frequency information. In
simplex mode, the transmit frequency shall default to the Main receive frequency; therefore,
the second label is not required.
Table 23: UHF COM Data Format Label 040
Function
P
ar
it
y
(
o
d
d)
S
ign
/S
ta
tus
M
at
ri
x
10
0
MH
z
(
3)
10 MHz
(3)
1 MHz
(8)
0.1 MHz
(0)
12.5 kHz
(12.5)
S
im
p
le
x
W
or
d B
it
2
W
or
d B
it
1
Res
(SDI)
LABEL
UHF COM FREQ.
Octal
LSB MSB
1 2 4 1 2 4 1 2
Bit # 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
338.0125 MHz 1 0 0 1 0 0 1 1 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 1 0 0 0 0 0 1 0 0
0 4 0
Table 24: Modulation Bits
12 11 Function
0 0 AM modulation
0 1 FM, wideband modulation
1 0 FM, narrowband modulation
1 1 TX frequency encoded
Table 25: Bit 13
Bit Position Description
Bit 13 0 = Semi-duplex. 1 = Simplex
Table 26: SDI bit definition
SDI Bits
10 9
Radio Number
0 0 All Call
0 1 COM 1
1 0 COM 2
1 1 COM 3
Table 27: Sign Status Matrix definition
31 30 Status
0 0 Squelch Normal
0 1 No Computed Data
1 0 Functional Test
1 1 Receiver Squelch Open
Notes:
1. The 100 MHz position has an implied 200 MHz added.
2. The 12.5 kHz position uses the binary value multiplied by 12.5 kHz. This allows either
25 kHz or 12.5 kHz spaced channels as desired.
3. The LRU shall use the SSM matrix of label 040 to annunciate received corrupt or
invalid data by NCD.
4. The SSM matrix defines the bit configuration 10 for “Functional Test”, which shall
initiate any COM IBIT, unless the NAV is in the ILS mode.
5. A received SSM of 11 shall open the receiver’s squelch gate.